What is the Bullpup Shotgun? The Bullpup Shotgun in GTA 5 is modeled after the Kel-Tec KSG. Its most noticeable feature is the boxier profile compared to the regular Pump Shotgun. It has picatinny rails on the top, sides, and bottom of the weapon, which allows for various attachments. The enhanced version adds two iron sights, making aiming more precise, and gives the gun a more authentic...